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No difference in chick-provisioning by bridled and non-bridled Common Guillemots Uria aalge
Barrett, R.T. (2013) Seabird 26:1-7
Abstract
Despite recent evidence that bridled Common Guillemots (Uria aalge) may depend on more cold-water prey species that non-bridled, there was no morph-specific difference in the species composition or size of fish caught for chicks by adults in a North Norwegian colony. This supports the recent suggestion that selection pressure on the morphs acts in the non-breeding season, rather than in summer.

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Notes

see:

  • Kristensen, D.L., Erikstad, K.E., Reiertsen, T.K. & Moum, T. (2014) "Differential breeding investment in bridled and non-bridled common guillemots (Uria aalge): morph of the partner matters" Behavioral Ecology and Sociobiology 68(11):1851-1858
    [notes]
    http://dx.doi.org/10.1007/s00265-014-1794-8

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